The effect of enhanced helium abundances on the AGB-supernove mass transition

Amanda I. Karakas, Luke J. Shingles

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

Globular clusters are now known to harbour helium-rich stellar populations. While the stars we see today are all of low mass, there were once stars of all mass ranges with helium mass fractions up to Y ≈ 0.40. It has also been suggested that the younger stellar component of the Galactic bulge is both metal-rich and helium rich, with Y up to 0.40. In this study we investigate the effect of helium enrichment on the stellar evolution of stars near the AGB-supernova mass transition, which is 8 Msun for solar metallicity. In particular we show that the AGB-supernova mass transition decreases in mass with increasing helium abundance, for both metal-poor and metal-rich models. This will have an impact on the stellar yields and on the chemical evolution of helium rich stellar populations.

Original languageEnglish
Pages244-247
Number of pages4
Publication statusPublished - 01 Jan 2017
Event2017 AGB-Supernovae Mass Transition - Monte Porzio Catone, Italy
Duration: 27 Mar 201731 Mar 2017

Conference

Conference2017 AGB-Supernovae Mass Transition
CountryItaly
CityMonte Porzio Catone
Period27/03/201731/03/2017

Keywords

  • Galaxy: abundances, nucleosynthesis, abundances
  • ISM: abundances
  • Stars: abundances, stars: AGB and post-AGB

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiology Nuclear Medicine and imaging
  • Astronomy and Astrophysics
  • Instrumentation
  • Atomic and Molecular Physics, and Optics

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